Creasing-machine.



' No. 756,882. PATENTED APR. 12, 1904.

C. R. NELSON.

EAS MACHINE.

A IGATIO ED AUG. 14, 1903.

N0 IODBL.

ATTORNEY.

www me; i a LM/@N No. bmessa hPatented. April 1.52, 1904.

PATENT OFFICE.

CHARLES R. NELSON, OF CHICAGO, ILLINOIS.

CREASlNG-MACHINE.

SPECIFICATION formingpart of Letters Patent No. '7 56,882, dated April12, 1904.

n Application filed August 14, 1903. Serial No. 169,497. (No model.)

citizen of the United States, and a resident of Chicago,county of Cook,and State of Illinois,

. have invented certain new and useful Improvements inCreasing-Machines, of which, the following is'a specification and whichare .illustrated in the accompanying drawings, forming a partv thereof.

This invention relates to machinesfor creasing sheets of paper used inloose-leaf books,

such as ledgers, the sheets being creased adjacent to their inner edges,so that they will lie flat When the book is opened, the creases forming,in a sense, a hinge.

It has heretofore been found practically impossible to crease the heavypaper such as is required in accountbooks by machinery, the diiiicultybeing to form the creases perfectly straight and parallel with the edgeof the sheet. The more common practice has been to crease the sheets byhand operation,which is necessarily very slow and consequently eX-pensive. It is preferable to form several creases in the sheet closetogether, and it is necessary that they be strictly straight, for ifthey curve even slightly they tend to stiffen the sheet, while thepurpose of introducing them is to increase its flexibility.

This invention resides in the rolls and peripheral groove, the groovesbeing so formed that by passing a sheet between them it isl View of thesame. Fig. 3 is a detail, partly insection, of a pair of creasing-rolls.Fig. 4 is a detail, partly in section,of a slightly-modiw fied form ofthe creasing-roll; and Fig. 5 is a detail in perspective of a sheet ofpaper after having been operated upon by the creasingmachine.

The particular form of the body of the machine is immaterial. As shown,it comprises a frame 10, within which is journal ed a powershaft 11,carrying a gear wheel 12, which meshes with a pinion 1,3, fixed upon ashaft 14., carrying a creasing-roll 15, which is one of a pair, itscompanion roll 16 being mounted upon a shaft 17, journaled in a swingingframe 18, pivoted to a pair of bracket-arms 19 19,pro

' jecting from thexframe 10. A spring 2O or equivalent device draws theroll 16 down upon the roll 15.

Atable 21 is provided for the bundle of loose i apeXes of theintervening ridges being corre spondingly attened, as shown at 24..Preferably the bottoms of the grooves are rendered slightly convex, asshown at 26, the apexes of the intervening ridges being concave,as shownat 27, so that'thetwo will intermesh. Asheet of paper being fed betweenthe two rolls is creased without mutilation, but is stretched by theribs of the rolls, so that it is rendered thinner wherel creased, thecreases being formedIwithout contracting the sheet, leaving its widthentirely unchanged. This stretching is accomplished by the form of theroll-faces, as their ribs draw the material down into the grooves andhold it against lateral slippage, the concavo convex contour of themeeting portions of the rolls (shown in Fig. 4) contributing to thisaction.

I claim as my invention-.

1. In a creasing-machine, in combination, a pair of complementaryintermeshing circumferentially-ribbed rolls, having the apexes of theirribs concaved and the apeXes of the bottoms of the grooves between theirribs convexed.V

Q. Inacreasing-Inachine, in combination, a ing grooves being coneaveol,and means for frame, a roll Journaled 1n the frame, a swingrotating therolls.

ing frame, a roll journaled n the swinging w frame and bearing upon thefirst mentioned CHARLES R NELbON' 5 roll, the faces of said rolls beingcorrespond- Witnesses:

ingly ciroumferentally ribbed, the apeXes of LOUIS K. GILLsoN,

their ribs and the. bottoms of the interven- E. M. KLATGHER.

